APA (7th ed.) Citation

McDonald, M. E. (1981). Key to trematodes reported in waterfowl. U.S. Dept. of the Interior, Fish and Wildlife Service.

Chicago Style (17th ed.) Citation

McDonald, Malcolm Edwin. Key to Trematodes Reported in Waterfowl. Washington, D.C.: U.S. Dept. of the Interior, Fish and Wildlife Service, 1981.

MLA (9th ed.) Citation

McDonald, Malcolm Edwin. Key to Trematodes Reported in Waterfowl. U.S. Dept. of the Interior, Fish and Wildlife Service, 1981.